A few thoughts on the evolution of metal.

This argument is stupid. The only genres of metal are the core ones, Rabid Headbanger hit the nail on the head saying that metal is much more simplistic than a lot of you make it seem in some ways; Running Wild are heavy/speed metal, Amon Amarth are melodic death metal, Bathory has multiple styles, but his "Viking" era stuff is not "Viking metal". It fits accurately into the black or proto-folk metal styles.
 
Seriously... math metal is not a genre. I will listen to arguments for viking metal,even though I don't buy them, but math metal always can be reduced to technical _____ metal. There's no case where it can't be placed in another genre.
 
I think the term math metal is more legitimate than viking metal, since it's based on the musical aspect rather than lyrical.